Add 54/63 and 70/15
1st number: 54/63, 2nd number: 4 10/15
54/63 + 70/15 is 116/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 15 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 63 × 5 = 315,
54/63 = 54 × 5/63 × 5 = 270/315 - Likewise, for the 2nd fraction, since 15 × 21 = 315,
70/15 = 70 × 21/15 × 21 = 1470/315 - Add the two like fractions:
270/315 + 1470/315 = 270 + 1470/315 = 1740/315 - 1740/315 simplified gives 116/21
- So, 54/63 + 70/15 = 116/21
In mixed form: 511/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/63+70/30 54/63+70/45 54/63+70/75